BRITISH LICHENS

POL YBLASTIA VERRUCARIACELE 331
Nylander describes the spores as colourless. but in the authentic
specimens examined they are a clear light-brown with very distinct
1-3 well-marked transverse septa and muriform with small cells.
Hab. On schistose and arenaceous rocks.-B. M. Ben Lawers and
Craig-na-Lochan ( ?). Perthshire.
8. P. subviridicans A. L. Sm.-Thallus pale-greenish, thin,
continuous and wrinkled. Perithecia black, embedded in large
thalline tubercles, the ostiole papillate, small, depressed; perithecial
wall dimidiate; paraphyses none; spores 2 or 4 in the
ascus, oblong, colourless, muriform, large, 46-70!L long, 24-30 !L
thick.-Verrucaria subviridicans Nyl. in Flora Ix. 566 (1877);
Cromb. in Grevillea vi. 114 (1878); Leight. Lich. Fl. ed. 3, 488.
Specimen not seen.
Considered by Nylander to be very like the preceding, of which it
may be a subspecies. He also states that the thallus contains bluegreen
algal (gonimiose); that may however be acridental, and due to
the moist habitat.
Hab. On stones in torrents.-Dist. Rare in 'V. Ireland, near
Kylemore, Connemara, Galway.
9. P. subinumbrata A. L. Sm.-Thallus greyish-brown, very
thin or subevanescent. Perithecia immersed in brownish thalline
warts; perithecial wall black, entire; spores similar to those of
P. inumbrata but smaller, 22-30 !L long, 15-18 !L thick.-Verrucaria
subinumbrata Nyl. in Flora Ixi. 246 (1878); Cromb. in
Grevillea vii. 97; Leight. Lich. Fl. ed. 3, 492.
Perhaps only a subspecies of P. inumbrala (Ny]'l. c.). The specimen
in the herbarium of the British Museum collected by Larbalestier at
the same locality is a form of P. scotinospora with small, very dark,
muriform spores.
llab. On schistose rocks, Kylemore, Connemarn, Galway (the only
locality).
10. P. Sendtneri Krempelh. in Flora xxxviii. 67 (1855).­
Thallus whitish-grey, cartilaginous, incrusting, granular, unequal.
Perithecia black, minute, globose, semi-immersed, the ostiole
depressed; perithecial wall entire; paraphyses mucilaginous,
disappearing; spores 8 in the ascus, almost colourless or pa lidbrownish,
ovoid, muriform, 15-30 !L long, 9-15 !L thick; hymenial
gelatine wine-red with iodine.-Verrucaria Sendtneri Nyl. in
Maine et Loire. Mem. Soc. Acad. iv. 33 (1858); Carroll in Journ.
Bot. iii. 292 (1865); Leight. Lich. Fl. 4.59; ed. 3, 490.
The colour of the spores seems to vary a great deal, some authors
describing them as brownish, in the specimens examined they are
almost colourless.
llab. On mossy earth in alpine regions.-B. M. Ben Lawers, Perth·
shire.
11. P. gelatinosa Th. Fr. Lich. Arct. 262 (1860) & in Kgl.
Svensk. Vetensk.-Akad. Handl. vii. 2, 49 (1867).-Thallus thinnish,